Improved cab-brake



i the flange, as well as on the tread ofthe wheel.

SAMUEL MARDEN, oF NEWTo-N,-MASSAGHUSE'TTS;'

Letters Patent No. 74,235, datedFebruary 11, 1868-.

IMPROVED GAR-BRAKE.

Gilg gagnait referat tu it time Wetters ttmt zum making gmini tigt smite.

TO ALL WHOM IT MAY CONCERNE Be it known that I, SAMUEL MARDEN, of Newton, in the county of Middlesex, und State of Massachusetts, have invented a new and improved Brake, of which the following is a full description, reference being had to the accompanying drawings, making a part of the specification, in whichi Figure 1 is a plan.

Figure 2,'a part section and part elevation` Figure 3, a plan ofthe abutment; and

Figure 4 a. side elevation of one wedge. t

A is a car-wheel, and B, iig l, its supporting-rail or frame, uponwhich is firmly secured theabutment a; fig. 3, with its spline,f. Fig. 4 shows the wedge c, with its concave surface adapted tothe tread, andthe part d to the `flange of the Wheel. The groove e is made to correspond-with and work upon the splinefof the abutment a. b is the movablefulcrum ofthe lever C, which works the Wedge el. i

" To brake the wheel, a downward pressure is applied to the lever'C, which, working on its movable fulcruru,

b, carries the wedge c, workingthrough its groove, e, upon the splinef, firmly ,between the stationary abutment and the wheel. Raising the levers immediately takes oft' the brakes.

The advantages of my invention are, the small amount Vof power required in applying the brakes; the great resistance they offer to the wheel, one wedge pushing down against theiupward motion of the wheel with a greater amount of friction than the ordinary Vpressing-brake, while the other, by the downwardmotion of the wheel, is firmly wedged in between the wheel and abutment, and which, if it should offer too great friction, such as to slide the wheel, can be easily regulated by continuing upward the concave surface of the wedge; the facility with which any part can be replaced,y and its perfect simplicity.

l. The stationary abutment a, with its spline,f, in combination with the wedge-brake c, wit-hits groove e, substantially as described.

2. The levers C C, in combination with the brakelwedge c, substantially as described'.

3. The wedge-brake c, with its projection or cam-brake d, for the purpose of operating onthe`periphery of 4. The wedge-brake c, constructed, arranged, and operated substantially as described.

SAML MARDEN.

lVl'itnesses:

JOHN R. BAKER, Gri N. HITCHCOCK. 

